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• phplondon conference 2008

  9 juin 2010, par Mikko Koppanen — Everything else, Imagick, PHP stuff, phplondon08

  To summarize it : I had fun My conference preparations started about two weeks before the conference. The PHPLondon fellows (Paul, Matt and Richard) asked me to do a small presentation about Imagick at the pre-conference social event. The presentation I assembled ended up being a little over two hours, give or take. The hardest part was to trim down from two hours to about 40 minutes (I didn’t want to bore the people with too many code examples). The slides are available at http://valokuva.org/talks if you need them for some reason.

  My conference day was pretty hectic from the beginning to the end. I gave a few demos about the products that we represent and the moment I opened my mouth for the first time people started leaving the room. I hope that it had something to do with the “My Framework is better than yours ?” talk starting at the same time

  I met quite a lot of new people at the conference and of course it was nice to see the familiar faces from other conferences and PHPLondon meetings. I was especially happy that I was able to answer the questions Nigel James had

  A huge thanks to the organizers for making this day possible !

• ffmpeg on the fly switch video from rtsp stream

  31 juillet 2021, par John Williamson

  I have a nest doorbell which provides a video stream via rtsp but for security the url is valid for just 4 minutes at which point a new url is provided i.e.

  


  15:25 - rtsps://stream-eu1-delta.dropcam.com:443/sdm_live_stream/CiQA2.....
15:29 - rtsps://stream-eu1-delta.dropcam.com:443/sdm_live_stream/vY8pB.....


  


  I'm able to play the individual streams to a rtsp-simple-server using

  


  ffmpeg -nostdin  -i  rtsps://stream-eu1-delta.dropcam.com:443/sdm_live_stream/CiQA2.... -q:v 1 -f rtsp rtsp://localhost:8554/live


  


  But is there any way to switch to the latest url on the fly ? I've looked at ffmpeg concate but this requires files. I don't really care about freezing or black between the switching, only that the output stream should remain open.

  


  ffmpeg version 4.2.4-1ubuntu0.1 running on Ubuntu 20.04.2 LTS

  


• speeding up x264 encoding (C++ code with libavcodec)

  20 décembre 2012, par Hrishikesh_Pardeshi

  I am trying to capture windows screen (continuous screen shots) and encode them into x264. For that I am using avcodec_encode_video2 function available with libavcodec. However, it takes a huge amount of time. The time fluctuates between 25 – 1800 milliseconds for encoding individual frames.

  I tried tried both 1080p and 720p with video recording on screen.

  These are the settings I am using. This was tested on Windows 7, win32 release build with 4 GB of RAM.

  bit_rate = 2000, width = 1920, height = 1080
  qmin = 0, qmax = 0, max_b_frames = 0, frame_rate = 25, pixel_format = YUV 4:4:4.
  The remaining settings are default which are fetched using avcodec_get_context_defaults3().

  Sample data(in milliseconds) for 20 frames (consecutive and chosen randomly) in a set of 250 frames.
  121, 106, 289, 126, 211, 30, 181, 58, 213, 34, 245, 50, 56, 364, 247, 171, 254, 83, 82, 229

  For the application it is a must that it captures at least at 15 fps. Can someone help out to tell whether any options can be used to improve the frame rate. I need to encode lossless, but I am open to some file size increase.

  Thanks in advance.